Die head



May 22, 1928.

s. F. NEWMAN ET AL DIE HEAD I Filed Aug. 10. 1922 g'wuc'rdmu I sammzlF Newman James GHarpe Patented May 2 2, 1928.

p UNITED STATES PATENT OFFICE.

SAMUEL r. imwmn m amuse. HARPER, or waimasno'no, rn'immvmu, A8-

" SIGNOBS 'ro m 1s macnmn comrm, or wamsnono, rnnnmvun, A

CORPORATION OF PENNSYLVANIA.

DIE HEAII' Application filed August 10, 1822.. Serial No. 500,878."

Our said invention relates to an improved die head of the stationary automatic type forv cutting threads on bolts, pipe and the like, the general features being somewhat similar to what is shown in the patent to Miller 1,296,546, March 4,.1919. It 'is an object of the invention to provide an nnproved means for holding the parts of the head together and in position on a shank adapted to be fixed in a chuck of ordinary t e. 1 Another object ofthe invention is to provide an improved cutter holding means.

Another object is to provide improved means for indicating the relative adjustment of the body and shank and still another is to provide improved means for excluding dirt'from the inside of the head.

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts, I

Figure 1 is a face View of the device,

Figure 2 a'section on line 22 of Figure 1, and

Figure 3, a side elevation of the co-operatingflanges and rings showing the graduations. I

In the drawings 10 indicates a shank adapted to be held in place by the ordinary chuck used in machines of this type, this shank having a concentric forwardly-extending flange 11. A ring12 located in front of said flange is fixed for longitudinal yielding movement relative thereto. by spring-pressed screws 13 similar to those shown in Figure 4 of the patent above referred to. The ring is held against rotation relative to the flange by a pair of pins 14 and 15 secured in any convenient manner to the flange; Another ring 16 is located in advance of the ring 12 andthis ring is connected to the cutter holding blocks 17 by any convenient means to open and close the cutter jaws by a rotative movement of the ring on the body 18. Rings 12 and 16 with-flanges :11 form a ring frame for said body. The pins 14 and 15 may have reduced portions 19 extending into bushings 20 for holding the ring 16 in a position corresponding to the closed position of the jaws, as in our co-pending application No. 580,210 of even date herewith, until said ring and the body shall have been moved longitudinally away from the shank and the ring 12 in the manner customary in mabe reduced at opposite sides as in said application.

The body 18 has bores extending from end to end thereof to receive the trunnions '21 a spring such. as is shown in our application No. 580,210 of even date herewith is preferably used for opening the head, in place of that here shown.

As will be understood the body 18 is movable longitudinally-with the ring 16 in the releasing movement of said ring and for this purpose it has a flange 26'at the forward or outer end, and an annular recess at its inner or rear end to receive a collar 27 with segmental inturned flanges or lugs 32 and 33 engaging recesses at theinner end of the body. This collar'is fixed to the body in any convenient manner (not shown) and forms spacin means between the body and the inner si e of the flange on the shank,

chines of this type and these extensions may lugs '33 at the same time providing con- I venient means for retaining the springs 25 and springs surrounding them and bearing against 'the lower ends of recesses in the flangeas in the patent above referred to. The ring 12 acts through ring 28 against the collar 27 fixed td the head body to prevent relative longitudinal movement between thse parts. Thus it will be seen that the head body with the parts carried thereby and rings 12, 16 and 28, forms a unit which moves forward away from the flange 1.1 in opening the head, the ring 16 also hav ing rotary movement on the body after the longitudinal movement is completed. Pin 31 engages ring 28 on collar 27 to drive one from the other. Any convenient adjusting means may be provided for rotating the body slightly relative to the ring 16 to vary the diameter of the space enclosed by the cutters, one such means being shown in our above mentioned co-pending application of even date herewith. A flan e 29 is provided on the shank to engage the lnterior of the body and provide an additional hearing therefor. This flange forms an inner guard to exclude dirt or metal shavings from the space back of the head therein, and ring 28 provides an outer guard for the same purpose, the flange also serv ing as a centering member if desired. A pm 30 on the body engages a laterally elongated-opening in the ring 16 to limit the. oscillation of the ring as it moves to open, and close the-head.

In the present embodiment of our invention we have shown the. blocks 17 as adapted to hold longitudinally grooved tan ential cutters or chasers 34 of the. well-inown jLandis type, though some features of our invention are adapted for 'use with c'utters of other varieties. It will be obvious to those skilled in the art thatvarious changes may be made in the device above disclosed without departing from the s irit of. the invention, the true scope of which is indicated in the appended claims.

Having thus fully described our said invention, what we claim as new and desire to secure by Letters Patent, is:

1. A die head having a shank, a rin frame extending forwardly therefrom said rin frame including a ring movable longitudmally of the head, a head bod within said ring, a flange on said head bo y-engag in the forward end of said ri ,a separate co lar at the rear endof, sai head body engaging therear end. of saidring frame to prevent. relative longitudinal movement -.be-

tween the head body-and the ring frame,

trunnions supported in said body, cutter holders moving said cutter-holders o'utward' com prising springs arrangedin bores in said body saidcollar having flan es to hold said %y as set forth.

-2.- A die head comprising a body, sup orting means therefor surrounding the ody and the boresv on said 'trunnions, and means for and comprisin means movable longitudina-lly with the dy, a collar at the rear end of the body engaging said lon itudinall movable means, cutters on'the bo y movab e to open and closed positions, and means for opening said head including springs mounted inlongitudinal bores on said 'body said collar having flanges to hold said springs in place, substantially as set forth.

3. A die head comprising a hollow body having longitudinal bores, trunnions mount-.

body and the rings being movable toward and from the shank and the rearmost ring having a flange, and a collar on the body bearing against the rearmost ring and cooperating with the flange thereof and the inner flange on the shank to exclude dirt from the interior of the head said collar also having a flange for holding 'said springs in place, substantially as set forth. 1

4. In a die head, a body havin tudinal bores, supporting means t erefor,

longi- I cutter-holders pivoted in certain of said.

bores, means to secure said cutter holdersin place in said bores, springs in otherbores, a about the body rotatable relatively Iln the eto and adapted to be moved, by said springs for opening the head, and a collar engaging a portion of said supportln means to prevent longitudinal movement 0 the body relative to such'portion said collar having means for en aging said springs to hold them in place an leaving the cutterholder 'su porting bores free, substantially as set-for e 5. In a cutter head, a shank having a radial flange, a head body movable axially away from said shank, longitudinall -ser-- rated tangential cutters on the head ody, an oscillatory ring on the head body for moving the cutters into and out of'working position, a second ring on .the head body, pins carried by. the shank for locking said oscillatory 'ring' said pins fitting closely m bearings in said second ring, a third ring uniform in diameter with said flange and the other rin said third ring' bemg secured to the ibdy for axialand rotatable :movement therewith relatively to the shank, a flange on said third ring overla ping a reduced portion of the flange on sai shank,

and graduations on' adjacent peripheral faces of said relatively rotatable flanges for indicating the operative size of the head, substantially as set forth.

6. In 8,1116 head, a b'odyh-aving longitudi- III nal bores, chasers on said body, springs in In witness whereof, we have hereunto set said bores for moving the chasers out of our hands at Waynesboro, Pennsylvania operative position, and a rin secured to the this twenty-ninth day of July, A. D. nine- 10 body said ring having projections extendteen hundred and twenty-two.

5 ing over said bores at one end thereof to hold said springs in place, substantially as SAMUEL F. NEWMAN. set forth. JAMES G. HARPER. 

